MemoryStream optimizations

4 files changed, 17 insertions, 10 deletions

diff --git a/Emby.Server.Implementations/AppBase/ConfigurationHelper.cs b/Emby.Server.Implementations/AppBase/ConfigurationHelper.cs
index 0b681fddf..4c9ab33a7 100644
--- a/Emby.Server.Implementations/AppBase/ConfigurationHelper.cs
+++ b/Emby.Server.Implementations/AppBase/ConfigurationHelper.cs
@@ -1,3 +1,5 @@
+#nullable enable
+
 using System;
 using System.IO;
 using System.Linq;
@@ -22,7 +24,7 @@ namespace Emby.Server.Implementations.AppBase
         {
             object configuration;
 
-            byte[] buffer = null;
+            byte[]? buffer = null;
 
             // Use try/catch to avoid the extra file system lookup using File.Exists
             try
@@ -36,19 +38,23 @@ namespace Emby.Server.Implementations.AppBase
                 configuration = Activator.CreateInstance(type);
             }
 
-            using var stream = new MemoryStream();
+            using var stream = new MemoryStream(buffer?.Length ?? 0);
             xmlSerializer.SerializeToStream(configuration, stream);
 
             // Take the object we just got and serialize it back to bytes
-            var newBytes = stream.ToArray();
+            byte[] newBytes = stream.GetBuffer();
+            int newBytesLen = (int)stream.Length;
 
             // If the file didn't exist before, or if something has changed, re-save
-            if (buffer == null || !buffer.SequenceEqual(newBytes))
+            if (buffer == null || !newBytes.AsSpan(0, newBytesLen).SequenceEqual(buffer))
             {
                 Directory.CreateDirectory(Path.GetDirectoryName(path));
 
                 // Save it after load in case we got new items
-                File.WriteAllBytes(path, newBytes);
+                using (var fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))
+                {
+                    fs.Write(newBytes, 0, newBytesLen);
+                }
             }
 
             return configuration;
diff --git a/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs b/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs
index 970f5119c..688216373 100644
--- a/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs
+++ b/Emby.Server.Implementations/HttpServer/HttpResultFactory.cs
@@ -105,7 +105,7 @@ namespace Emby.Server.Implementations.HttpServer
                 responseHeaders = new Dictionary<string, string>();
             }
 
-            if (addCachePrevention && !responseHeaders.TryGetValue(HeaderNames.Expires, out string expires))
+            if (addCachePrevention && !responseHeaders.TryGetValue(HeaderNames.Expires, out _))
             {
                 responseHeaders[HeaderNames.Expires] = "0";
             }
@@ -326,7 +326,8 @@ namespace Emby.Server.Implementations.HttpServer
             return GetHttpResult(request, ms, contentType, true, responseHeaders);
         }
 
-        private IHasHeaders GetCompressedResult(byte[] content,
+        private IHasHeaders GetCompressedResult(
+            byte[] content,
             string requestedCompressionType,
             IDictionary<string, string> responseHeaders,
             bool isHeadRequest,
diff --git a/Emby.Server.Implementations/HttpServer/StreamWriter.cs b/Emby.Server.Implementations/HttpServer/StreamWriter.cs
index 5afc51dbc..00e3ab8fe 100644
--- a/Emby.Server.Implementations/HttpServer/StreamWriter.cs
+++ b/Emby.Server.Implementations/HttpServer/StreamWriter.cs
@@ -95,13 +95,13 @@ namespace Emby.Server.Implementations.HttpServer
 
                 if (bytes != null)
                 {
-                    await responseStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
+                    await responseStream.WriteAsync(bytes, 0, bytes.Length, cancellationToken).ConfigureAwait(false);
                 }
                 else
                 {
                     using (var src = SourceStream)
                     {
-                        await src.CopyToAsync(responseStream).ConfigureAwait(false);
+                        await src.CopyToAsync(responseStream, cancellationToken).ConfigureAwait(false);
                     }
                 }
             }
diff --git a/Emby.Server.Implementations/Serialization/MyXmlSerializer.cs b/Emby.Server.Implementations/Serialization/MyXmlSerializer.cs
index 296822981..c8986461e 100644
--- a/Emby.Server.Implementations/Serialization/MyXmlSerializer.cs
+++ b/Emby.Server.Implementations/Serialization/MyXmlSerializer.cs
@@ -95,7 +95,7 @@ namespace Emby.Server.Implementations.Serialization
         /// <returns>System.Object.</returns>
         public object DeserializeFromBytes(Type type, byte[] buffer)
         {
-            using (var stream = new MemoryStream(buffer))
+            using (var stream = new MemoryStream(buffer, 0, buffer.Length, false, true))
             {
                 return DeserializeFromStream(type, stream);
             }